Agreed although the description of the sound didn't seem like an airplane to me. It could also just have been a sound from a different source that happened to occur at roughly the same time as the contrail formation.
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Based on her firsthand descriptions, pictures, and our past experiences with hobby rockets - not to mention the near-daily familiarity with contrails.... here is my current opinion. It was a hobby rocket that greatly exceeds the size and altitude capabilities of ones we've seen thus far.
I can comment with extremely high confidence that IT WAS NOT CONTRAILS FROM AN AIRPLANE.
She and I fully acknowledge and are highly familiar with the relative perspective of plane contrails, when coming straight at (or away) from us. They can appear very similar to this.
Nevertheless, this was vertical and was created in a matter of 7-8 seconds and then dissipated in 30-45 more. Thusly, the scale and distance are significantly smaller/shorter than that of a commercial airliner.
She did not capture it in pictures, but just below where the white plum begins, there was a brief darker "poof" when the second (or third?) stage ignited, which then took it up into the clouds.
Just as ChickNorris suggests, it is most likely a school project or F size motor, something just below the threshold of waiver-requirement, and my wife was much closer to it than she thought.
Another flat earther ? :D
Haha, yeah could be MrPrena :)
Or maybe it was someone trying to escape this planet.
Someone was beamed up?!?